I am of the opinion that it is, but I am not 100 percent sure. Any info on this would be appreciated.
I hate to give you a Wikipedia answer, but the article on the album (that you, in fact, reference in the question) indicates that it is.
To quote from the Lyrics section:
"Soma" takes influence from Aldous Huxley's 1932 novel Brave New World and its featured imaginary drug, soma. Here Casablancas is discussing drug use in order to fit in with the cool crowd.[**31]
The footnote for this is:
Hammond, Albert, Jr. (Oct 26, 2013). "The 500 Greatest Albums of All Time: Number Four - The Strokes". I P C ignite! Ltd. NME - New Musical Express. p. 83.
Unfortunately, it's not online (that I can find), so I can't validate it beyond this. That said, the lyrics seem to support this explanation.